"Then I will take a decision for tomorrow".
"I'm a bit pissed off because I feel like I played well and that's the upsetting part of it - I could have done great in this tournament".
Roger Federer, seeded second to Nadal, also was not detained for long as he defeated Ukrainian qualifier Alexandr Dolgopolov 6-4, 6-2.
"I have been dealing with all my injuries in the past, and now it's time to take care of my body, see what the MRI says or what the doctor says". The top seed consolidated to make it 5-2 before serving out the match.
World number five Cilic secured his place in the semi-finals with a routine victory over Spain's Albert Ramos-Vinolas.
Roger Federer, the only man who can deny Nadal the year-end world number one ranking, powered past Frenchman Richard Gasquet 7-5 6-4.
"But if nothing unsafe happened, I will be here to play tomorrow and doing my best".
"A lot of matches in a row winning and very happy with everything, let's see what happens tomorrow, but being able to win in Beijing and now semifinals here. tough events against tough players". "The game where he broke me, I was up 40-15, and I was just unfocused there".
The Spaniard, 31, breezed through the first set but was unable to break Dimitrov in the second, and the Bulgarian was strong in the tie-break to force a deciding set.
Nadal saved both break points he faced in the round-of-16 match, in the fourth game of the second set.
His foot appeared to get stuck on the floor and he crumpled down, landing with his weight on his outstretched left hand - his predominantly non-playing hand - and bending it painfully backward.